Analysis of GPR data: wave propagation velocity determination
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文摘
In a granitic quarry, with the help of a borehole cored 40 m deep, the limits of velocity analysis based on normal moveout corrections were appraised. The degree of error caused by slightly dipping reflectors was characterised and instability of interval velocity calculations caused by uncertainties in reflection time and RMS velocity assessment was shown. At a limestone quarry site it was shown that, by working on several paths of electromagnetic waves, direct velocity determinations could help in differentiating rocks in the same formation, based on quality of the field data. Finally, velocities calculated in an anisotropic environment and in geological formations covered by a road or a concrete surface were analysed.